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Title:
Turbulent stresses as a function of shear rate in a local disk model
Authors:
Liljeström, A. J.; Korpi, M. J.; Käpylä, P. J.; Brandenburg, A.; Lyra, W.
Affiliation:
AA(Observatory, University of Helsinki, PO BOX 14, FI-00014 University of Helsinki, Finland), AB(Observatory, University of Helsinki, PO BOX 14, FI-00014 University of Helsinki, Finland), AC(Observatory, University of Helsinki, PO BOX 14, FI-00014 University of Helsinki, Finland), AD(NORDITA, AlbaNova University Center, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden), AE(Department of Physics and Astronomy, Uppsala Astronomical Observatory, Box 515, 751 20 Uppsala, Sweden)
Publication:
Astronomische Nachrichten, Vol.330, Issue 1, p.92 (AN Homepage)
Publication Date:
01/2009
Origin:
AN
Keywords:
accretion, accretion disks, instabilities, magnetohydrodynamics (MHD), turbulence
DOI:
10.1002/asna.200811131
Bibliographic Code:
2009AN....330...92L

Abstract

We present local numerical models of accretion disk turbulence driven by the magnetorotational instability with varying shear rate. The resulting turbulent stresses are compared with predictions of a closure model in which triple correlations are modelled in terms of quadratic correlations. This local model uses five nondimensional parameters to describe the properties of the flow. We attempt to determine these closure parameters for our simulations and find that the model does produce qualitatively correct behaviour. In addition, we present results concerning the shear rate dependency of the magnetic to kinetic energy ratio. We find both the turbulent stress ratio and the total stress to be strongly dependent on the shear rate.
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